The joint at the corner (5)

I believe the answer is:

mitre

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'the joint' is the definition.
(mitre joint is a kind of joint)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for mitre that I've seen before include "Bishop's cap - wood joint" , "Clerical coverage" , "Kind of joint" , "Corner joint - bishop's headdress" , "Bishop's tall headdress" .)

I've seen this clue in the Evening Standard.

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